Magnetic north is something else.

磁北极就是另一回事了。

It magnetic North Pole is moving.

磁北极正在移动。

Normally it points toward magnetic north.

正常地它指向磁北极。

A built-in direction sensor detects magnetic north.

内置的方向传感器检测磁北。

The heading of the airplane relative to magnetic north.

相对于磁北的飞机航向。